1 cup all purpose flour
1 Tablespoon Sugar
1 pinch salt
6 Tablespoon Unsalted butter, cold
1 Egg yolk, slightly whisked
1 Tablespoon Lemon juice
3 Tablespoon Cornstarch
1 Tablespoon Grand Marnier, or more if needed
3/4 cup Sugar
1 cup boysenberries or more as needed
In large bowl, stir together flour, sugar and salt. With pastry blender or food processor, cut in butter until it resembles tiny peas. Mix together egg yolk, lemon juice and 1 tablespoon water; sprinkle over flour mixture. Stirring with fork, add a little more water if necessary to hold dough together. Using hands, gently shape pastry into ball. Press dough 1/8″ thick into flan pan. Refrigerate while making filling.
Preheat oven to 425°.
In small saucepan, stir together Grand Marnier & cornstarch till smooth. Stir in sugar. Add boysenberries and cook, stirring, over medium-low heat for 10-15 minutes or till thickened.
Let cool; spoon into shell, filling no more than 2/3 full. Bake in 425° oven for 10 minutes. Reduce heat to 350° and bake 15 minutes longer or till pastry is golden brown. Let cool 15 minutes before removing to rack.